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Stockholders' Deficit (Tables)
9 Months Ended
Sep. 30, 2013
Stockholders' deficit  
Summary of stock option activity under the Plan

 

 

 

 

Number of
Options

 

Weighted-
Average Price

 

 

 

 

 

 

 

Balance at December 31, 2012

 

1,432,369

 

$

1.43

 

Granted

 

331,860

 

5.60

 

Canceled

 

(17,860

)

1.56

 

Exercised

 

(35,852

)

0.65

 

Balance at September 30, 2013

 

1,710,517

 

2.26

 

Schedule of allocation of stock-based compensation for all options and restricted stock awards

The allocation of stock-based compensation for all options and restricted stock awards is as follows (in thousands):

 

 

 

Three Months Ended
September 30,

 

Nine Months Ended
September 30,

 

 

 

2013

 

2012

 

2013

 

2012

 

 

 

 

 

 

 

 

 

 

 

Research and development

 

$

581

 

$

32

 

$

686

 

$

82

 

General and administrative

 

401

 

10

 

483

 

24

 

 

 

$

982

 

$

42

 

$

1,169

 

$

106

 

Employee stock option
 
Stockholders' deficit  
Schedule of weighted-average assumptions used to determine the fair value of stock option grants

 

 

 

 

Nine Months Ended
September 30,

 

 

 

2013

 

2012

 

 

 

 

 

 

 

Risk-free interest rate

 

2.1

%

1.2

%

Expected volatility

 

90.3

%

93.5

%

Remaining contractual term (in years)

 

7.27

 

7.23

 

Expected dividend yield

 

0.0

%

0.0

%

Non-employee stock option
 
Stockholders' deficit  
Schedule of weighted-average assumptions used to determine the fair value of stock option grants

 

 

 

 

Nine Months Ended
September 30,

 

 

 

2013

 

2012

 

 

 

 

 

 

 

Risk-free interest rate

 

1.6

%

1.0

%

Expected volatility

 

90.2

%

93.5

%

Expected term (in years)

 

6.07

 

6.06

 

Expected dividend yield

 

0.0

%

0.0

%